(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

State the following:

The absolute temperature of a gas at 7°C

How does it occur in the free state and in the combined state.

State a reason to prove that water is a compound and not a element.

Why is fused calcium chloride and not potassium chloride kept in a desiccator?

State the number of elements in Period 1 of the Periodic Table.

State the number of elements in Period 2 of the Periodic Table.

State the number of elements in Period 3 of the Periodic Table.

What are the elements.

Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with halogens of group 17 [VIIA].
With special reference to valency electrons & ion formation.

How were elements arranged in the long form of the periodic table or the Modern Periodic Table?

Compare Modern Periodic Law with Mendeleev's Periodic Law.

What are the periods in a periodic table?

Give one reason why magnetizing a piece of steel is a physical change.

Give reason for Table salt becomes moist during rainy season.

Correct the following statement:

CO and Co  both represents cobalt.

Correct the following statement:

CO and Co  both represents cobalt.

Complete the following statement.

The chemical change involving iron and hydrochloric acid illustrates a _________________ reaction.

Complete the following statement.

In the type of reaction called_______________, two compounds exchange their positive and negative radicals.

Explain, giving one example of the following chemical changes:

Double decomposition